After getting into a fight with her beloved mother, Arisu wanders alone through the city streets. A passing man notices her and offers to help her return home, but she says she doesn't want to go back today. The kind man listens to her troubles and invites her to his place. When he gently offers her some snacks, noticing she's hungry, a dark impulse slowly begins to stir within her. Eventually, the seemingly innocent Arisu takes the man's lips for herself, corrupting the pure young girl as she surrenders to her desires.